package com.lizx.shoppingmall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lizx.common.utils.PageUtils;
import com.lizx.common.utils.Query;

import com.lizx.shoppingmall.product.dao.CategoryDao;
import com.lizx.shoppingmall.product.entity.CategoryEntity;
import com.lizx.shoppingmall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );
        return new PageUtils(page);
    }


    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有的树
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2.组装成树形结构
        //(1)找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        }).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {

        //TODO  1.检查当前删除的菜单，是否在其他地方引用
        baseMapper.deleteBatchIds(asList);
    }

    //递归查找
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter((categoryEntity)->{
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map((categoryEntity)->{
            // 找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

}